There are virtues of the body and virtues of the soul. Those of the body include fasting, vigils, sleeping on the ground, ministering to people’s needs, working with one’s hands so as not to be a burden or in order to give to others (cf. 1 Thess. 2:9, Ephes. 4:28). Those of the soul include love, long-suffering, gentleness, self-control, and prayer (cf. Gal, 5:22). If as a result of some constraint or bodily condition, such as illness or the like, we find we cannot practice the bodily virtues mentioned above, we are forgiven by the Lord because He knows the reasons. But if we fail to practice the virtues of the soul, we shall not have a single excuse, for it is always within our power to practice them.

—St Maximos the Confessor, Four Hundred Texts on Love